PA6 vs PA66: Material Selection Guide for Engineering Structural Parts
Heat resistance, moisture absorption, mechanical strength — which nylon fits your product?
PA6 and PA66 are the two most commonly used nylons in engineering plastics. They look similar but have significant performance differences. PA66 offers higher heat resistance and strength but costs more and is harder to process; PA6 provides better processability and surface finish. This guide helps you make the optimal choice across cost, performance, and processing dimensions.
PA6 — Easy Processing, High Cost-Effectiveness
PA66 — High Heat Resistance, High Strength
Quick Comparison
| Property | PA6 — Easy Processing, High Cost-Effectiveness | PA66 — High Heat Resistance, High Strength |
|---|---|---|
| Melting Point | 220-225°C | 255-265°C |
| HDT (1.82 MPa, GF30) | 200-210°C | 250-260°C |
| Water Absorption (23°C/24h) | 1.5-2.0% | 1.0-1.5% |
| Tensile Strength (GF30) | 170-190 MPa | 190-210 MPa |
| Processing Temperature | 230-280°C | 260-300°C |
| Cost | 较低（约 ¥16-22/kg GF30） | 较高（约 ¥22-30/kg GF30） |
Recommendation
Recommendation: Choose PA66+GF for high-temperature environments like power tool housings, radiator components, and engine bay parts. PA6 is sufficient for general mechanical parts, casters, cable ties, office chair bases — more cost-effective. Both materials MUST be thoroughly dried (moisture <0.1%) to avoid severe property degradation.
Conclusion
In short: PA66 for heat and strength, PA6 for processability and value. Jinsu supplies the full range of PA6 and PA66 grades (general purpose, glass-fiber reinforced, flame retardant). Free samples and formulation guidance available.